<?php

class grad {

	var $mpdf = null;

	function grad(&$mpdf) {
		$this->mpdf = $mpdf;
	}

	// mPDF 5.3.A1
	function CoonsPatchMesh($x, $y, $w, $h, $patch_array=array(), $x_min=0, $x_max=1, $y_min=0, $y_max=1, $colspace='RGB', $return=false){
		$s=' q ';
		$s.=sprintf(' %.3F %.3F %.3F %.3F re W n ', $x*_MPDFK, ($this->mpdf->h-$y)*_MPDFK, $w*_MPDFK, -$h*_MPDFK);
		$s.=sprintf(' %.3F 0 0 %.3F %.3F %.3F cm ', $w*_MPDFK, $h*_MPDFK, $x*_MPDFK, ($this->mpdf->h-($y+$h))*_MPDFK);
		$n = count($this->mpdf->gradients)+1;
		$this->mpdf->gradients[$n]['type'] = 6; //coons patch mesh
		$this->mpdf->gradients[$n]['colorspace'] = $colspace; //coons patch mesh
		$bpcd=65535; //16 BitsPerCoordinate
		$trans = false;
		$this->mpdf->gradients[$n]['stream']='';
		for($i=0;$i<count($patch_array);$i++){
			$this->mpdf->gradients[$n]['stream'].=chr($patch_array[$i]['f']); //start with the edge flag as 8 bit
			for($j=0;$j<count($patch_array[$i]['points']);$j++){
				//each point as 16 bit
				if (($j % 2) == 1) {	// Y coordinate (adjusted as input is From top left)
					$patch_array[$i]['points'][$j]=(($patch_array[$i]['points'][$j]-$y_min)/($y_max-$y_min))*$bpcd;
					$patch_array[$i]['points'][$j]=$bpcd-$patch_array[$i]['points'][$j];
				}
				else {
					$patch_array[$i]['points'][$j]=(($patch_array[$i]['points'][$j]-$x_min)/($x_max-$x_min))*$bpcd;
				}
				if($patch_array[$i]['points'][$j]<0) $patch_array[$i]['points'][$j]=0;
				if($patch_array[$i]['points'][$j]>$bpcd) $patch_array[$i]['points'][$j]=$bpcd;
				$this->mpdf->gradients[$n]['stream'].=chr(floor($patch_array[$i]['points'][$j]/256));
				$this->mpdf->gradients[$n]['stream'].=chr(floor($patch_array[$i]['points'][$j]%256));
			}
			for($j=0;$j<count($patch_array[$i]['colors']);$j++){
				//each color component as 8 bit
				if ($colspace=='RGB') {
					$this->mpdf->gradients[$n]['stream'].=($patch_array[$i]['colors'][$j][1]);
					$this->mpdf->gradients[$n]['stream'].=($patch_array[$i]['colors'][$j][2]);
					$this->mpdf->gradients[$n]['stream'].=($patch_array[$i]['colors'][$j][3]);
					if (isset($patch_array[$i]['colors'][$j][4]) && ord($patch_array[$i]['colors'][$j][4])<100) { $trans = true; }
				}
				else if ($colspace=='CMYK') {
					$this->mpdf->gradients[$n]['stream'].=chr(ord($patch_array[$i]['colors'][$j][1])*2.55);
					$this->mpdf->gradients[$n]['stream'].=chr(ord($patch_array[$i]['colors'][$j][2])*2.55);
					$this->mpdf->gradients[$n]['stream'].=chr(ord($patch_array[$i]['colors'][$j][3])*2.55);
					$this->mpdf->gradients[$n]['stream'].=chr(ord($patch_array[$i]['colors'][$j][4])*2.55);
					if (isset($patch_array[$i]['colors'][$j][5]) && ord($patch_array[$i]['colors'][$j][5])<100) { $trans = true; }
				}
				else if ($colspace=='Gray') {
					$this->mpdf->gradients[$n]['stream'].=($patch_array[$i]['colors'][$j][1]);
					if ($patch_array[$i]['colors'][$j][2]==1) { $trans = true; }	// transparency converted from rgba or cmyka()
				}
			}
		}
		// TRANSPARENCY
		if ($trans) {
			$this->mpdf->gradients[$n]['stream_trans']='';
			for($i=0;$i<count($patch_array);$i++){
				$this->mpdf->gradients[$n]['stream_trans'].=chr($patch_array[$i]['f']);
				for($j=0;$j<count($patch_array[$i]['points']);$j++){
					//each point as 16 bit
					$this->mpdf->gradients[$n]['stream_trans'].=chr(floor($patch_array[$i]['points'][$j]/256));
					$this->mpdf->gradients[$n]['stream_trans'].=chr(floor($patch_array[$i]['points'][$j]%256));
				}
				for($j=0;$j<count($patch_array[$i]['colors']);$j++){
					//each color component as 8 bit // OPACITY
					if ($colspace=='RGB') {
						$this->mpdf->gradients[$n]['stream_trans'].=chr(intval(ord($patch_array[$i]['colors'][$j][4])*2.55));
					}
					else if ($colspace=='CMYK') {
						$this->mpdf->gradients[$n]['stream_trans'].=chr(intval(ord($patch_array[$i]['colors'][$j][5])*2.55));
					}
					else if ($colspace=='Gray') {
						$this->mpdf->gradients[$n]['stream_trans'].=chr(intval(ord($patch_array[$i]['colors'][$j][3])*2.55));
					}
				}
			}
			$this->mpdf->gradients[$n]['trans'] = true;
			$s .= ' /TGS'.$n.' gs ';
		}
		//paint the gradient
		$s .= '/Sh'.$n.' sh'."\n";
		//restore previous Graphic State
		$s .= 'Q'."\n";
		if ($return) { return $s; }
		else { $this->mpdf->_out($s); }
	}


	// type = linear:2; radial: 3;
	// Linear: $coords - array of the form (x1, y1, x2, y2) which defines the gradient vector (see linear_gradient_coords.jpg).
	//    The default value is from left to right (x1=0, y1=0, x2=1, y2=0).
	// Radial: $coords - array of the form (fx, fy, cx, cy, r) where (fx, fy) is the starting point of the gradient with color1,
	//    (cx, cy) is the center of the circle with color2, and r is the radius of the circle (see radial_gradient_coords.jpg).
	//    (fx, fy) should be inside the circle, otherwise some areas will not be defined
	// $col = array(R,G,B/255); or array(G/255); or array(C,M,Y,K/100)
	// $stops = array('col'=>$col [, 'opacity'=>0-1] [, 'offset'=>0-1])
	function Gradient($x, $y, $w, $h, $type, $stops=array(), $colorspace='RGB', $coords='', $extend='', $return=false, $is_mask=false) {
		if (strtoupper(substr($type,0,1)) == 'L') { $type = 2; }	// linear
		else if (strtoupper(substr($type,0,1)) == 'R') { $type = 3; }	// radial
		if ($colorspace != 'CMYK' && $colorspace != 'Gray') {
			$colorspace = 'RGB';
		}
		$bboxw = $w;
		$bboxh = $h;
		$usex = $x;
		$usey = $y;
		$usew = $bboxw;
		$useh = $bboxh;
		if ($type < 1) { $type = 2; }
		if ($coords[0]!==false && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i',$coords[0],$m)) {
			$tmp = $this->mpdf->ConvertSize($m[1],$this->mpdf->w,$this->mpdf->FontSize,false);
			if ($tmp) { $coords[0] = $tmp/$w; }
		}
		if ($coords[1]!==false && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i',$coords[1],$m)) {
			$tmp = $this->mpdf->ConvertSize($m[1],$this->mpdf->w,$this->mpdf->FontSize,false);
			if ($tmp) { $coords[1] = 1-($tmp/$h); }
		}
		// LINEAR
		if ($type == 2) {
			$angle = $coords[4];
			$repeat = $coords[5];
			// ALL POINTS SET (default for custom mPDF linear gradient) - no -moz
			if ($coords[0]!==false && $coords[1]!==false && $coords[2]!==false && $coords[3]!==false) {
				// do nothing - coords used as they are
			}

			// If both a <point> and <angle> are defined, the gradient axis starts from the point and runs along the angle. The end point is
			// defined as before - in this case start points may not be in corners, and axis may not correctly fall in the right quadrant.
			// NO end points (Angle defined & Start points)
			else if ($angle!==false && $coords[0]!==false && $coords[1]!==false && $coords[2]===false && $coords[3]===false) {
		  if ($angle==0 || $angle==360) { $coords[3]=$coords[1]; if ($coords[0]==1) $coords[2]=2; else $coords[2]=1; }
		  else if ($angle==90) { $coords[2]=$coords[0]; $coords[3]=1; if ($coords[1]==1) $coords[3]=2; else $coords[3]=1; }
		  else if ($angle==180) { if ($coords[4]==0) $coords[2]=-1; else $coords[2]=0; $coords[3]=$coords[1]; }
		  else if ($angle==270) { $coords[2]=$coords[0]; if ($coords[1]==0) $coords[3]=-1; else $coords[3]=0; }
		  else {
		  	$endx=1; $endy=1;
		  	if ($angle <=90) {
		  		if ($angle <=45) { $endy=tan(deg2rad($angle)); }
		  		else { $endx=tan(deg2rad(90-$angle)); }
		  		$b = atan2(($endy*$bboxh), ($endx*$bboxw));
		  		$ny = 1 - $coords[1] - (tan($b) * (1-$coords[0]));
		  		$tx = sin($b) * cos($b) * $ny;
		  		$ty = cos($b) * cos($b) * $ny;
		  		$coords[2] = 1+$tx; $coords[3] = 1-$ty;
		  	}
		  	else if ($angle <=180) {
		  		if ($angle <=135) { $endx=tan(deg2rad($angle-90)); }
		  		else { $endy=tan(deg2rad(180-$angle)); }
		  		$b = atan2(($endy*$bboxh), ($endx*$bboxw));
		  		$ny = 1 - $coords[1] - (tan($b) * ($coords[0]));
		  		$tx = sin($b) * cos($b) * $ny;
		  		$ty = cos($b) * cos($b) * $ny;
		  		$coords[2] =  -$tx; $coords[3] = 1-$ty;
		  	}
		  	else if ($angle <=270) {
		  		if ($angle <=225) { $endy=tan(deg2rad($angle-180)); }
		  		else { $endx=tan(deg2rad(270-$angle)); }
		  		$b = atan2(($endy*$bboxh), ($endx*$bboxw));
		  		$ny = $coords[1] - (tan($b) * ($coords[0]));
		  		$tx = sin($b) * cos($b) * $ny;
		  		$ty = cos($b) * cos($b) * $ny;
		  		$coords[2] = -$tx; $coords[3] = $ty;
		  	}
		  	else {
		  		if ($angle <=315) { $endx=tan(deg2rad($angle-270)); }
		  		else { $endy=tan(deg2rad(360-$angle));  }
		  		$b = atan2(($endy*$bboxh), ($endx*$bboxw));
		  		$ny = $coords[1] - (tan($b) * (1-$coords[0]));
		  		$tx = sin($b) * cos($b) * $ny;
		  		$ty = cos($b) * cos($b) * $ny;
		  		$coords[2] = 1+$tx; $coords[3] = $ty;

		  	}
		  }
			}

			// -moz If the first parameter is only an <angle>, the gradient axis starts from the box's corner that would ensure the
			// axis goes through the box. The axis runs along the specified angle. The end point of the axis is defined such that the
			// farthest corner of the box from the starting point is perpendicular to the gradient axis at that point.
			// NO end points or Start points (Angle defined)
			else if ($angle!==false && $coords[0]===false && $coords[1]===false) {
		  if ($angle==0 || $angle==360) { $coords[0]=0; $coords[1]=0; $coords[2]=1; $coords[3]=0; }
		  else if ($angle==90) { $coords[0]=0; $coords[1]=0; $coords[2]=0; $coords[3]=1; }
		  else if ($angle==180) { $coords[0]=1; $coords[1]=0; $coords[2]=0; $coords[3]=0; }
		  else if ($angle==270) { $coords[0]=0; $coords[1]=1; $coords[2]=0; $coords[3]=0; }
		  else {
		  	if ($angle <=90) {
		  		$coords[0]=0; $coords[1]=0;
		  		if ($angle <=45) { $endx=1; $endy=tan(deg2rad($angle)); }
		  		else { $endx=tan(deg2rad(90-$angle)); $endy=1; }
		  	}
		  	else if ($angle <=180) {
		  		$coords[0]=1; $coords[1]=0;
		  		if ($angle <=135) { $endx=tan(deg2rad($angle-90)); $endy=1; }
		  		else { $endx=1; $endy=tan(deg2rad(180-$angle)); }
		  	}
		  	else if ($angle <=270) {
		  		$coords[0]=1; $coords[1]=1;
		  		if ($angle <=225) { $endx=1; $endy=tan(deg2rad($angle-180)); }
		  		else { $endx=tan(deg2rad(270-$angle)); $endy=1; }
		  	}
		  	else {
		  		$coords[0]=0; $coords[1]=1;
		  		if ($angle <=315) { $endx=tan(deg2rad($angle-270)); $endy=1; }
		  		else { $endx=1; $endy=tan(deg2rad(360-$angle));  }
		  	}
		  	$b = atan2(($endy*$bboxh), ($endx*$bboxw));
		  	$h2 = $bboxh - ($bboxh * tan($b));
		  	$px = $bboxh + ($h2 * sin($b) * cos($b));
		  	$py = ($bboxh * tan($b)) + ($h2 * sin($b) * sin($b));
		  	$x1 = $px / $bboxh;
		  	$y1 = $py / $bboxh;
		  	if ($angle <=90) { $coords[2] = $x1; $coords[3] = $y1; }
		  	else if ($angle <=180) { $coords[2] = 1-$x1; $coords[3] = $y1; }
		  	else if ($angle <=270) { $coords[2] = 1-$x1; $coords[3] = 1-$y1; }
		  	else { $coords[2] = $x1; $coords[3] = 1-$y1; }
		  }
			}
			// -moz If the first parameter to the gradient function is only a <point>, the gradient axis starts from the specified point,
			// and ends at the point you would get if you rotated the starting point by 180 degrees about the center of the box that the
			// gradient is to be applied to.
			// NO angle and NO end points (Start points defined)
			else if ((!isset($angle) || $angle===false) && $coords[0]!==false && $coords[1]!==false) { 	// should have start and end defined
		  $coords[2] = 1-$coords[0]; $coords[3] = 1-$coords[1];
		  $angle = rad2deg(atan2($coords[3]-$coords[1],$coords[2]-$coords[0]));
		  if ($angle < 0) { $angle += 360; }
		  else if ($angle > 360) { $angle -= 360; }
		  if ($angle!=0 && $angle!=360 && $angle!=90 && $angle!=180 && $angle!=270) {
		  	if ($w >= $h) {
		  		$coords[1] *= $h/$w ;
		  		$coords[3] *= $h/$w ;
		  		$usew = $useh = $bboxw;
		  		$usey -= ($w-$h);
		  	}
		  	else {
		  		$coords[0] *= $w/$h ;
		  		$coords[2] *= $w/$h ;
		  		$usew = $useh = $bboxh;
		  	}
		  }
			}

			// -moz If neither a <point> or <angle> is specified, i.e. the entire function consists of only <stop> values, the gradient
			// axis starts from the top of the box and runs vertically downwards, ending at the bottom of the box.
			else {	// default values T2B
				// All values are set in parseMozGradient - so won't appear here
				$coords = array(0,0,1,0);	// default for original linear gradient (L2R)
			}
			$s = ' q';
			$s .= sprintf(' %.3F %.3F %.3F %.3F re W n', $x*_MPDFK, ($this->mpdf->h-$y)*_MPDFK, $w*_MPDFK, -$h*_MPDFK)."\n";
			$s .= sprintf(' %.3F 0 0 %.3F %.3F %.3F cm', $usew*_MPDFK, $useh*_MPDFK, $usex*_MPDFK, ($this->mpdf->h-($usey+$useh))*_MPDFK)."\n";
		}

		// RADIAL
		else if ($type == 3) {
			$radius = $coords[4];
			$angle = $coords[5];	// ?? no effect
			$shape = $coords[6];
			$size = $coords[7];
			$repeat = $coords[8];
			// ALL POINTS AND RADIUS SET (default for custom mPDF radial gradient) - no -moz
			if ($coords[0]!==false && $coords[1]!==false && $coords[2]!==false && $coords[3]!==false && $coords[4]!==false) {
				// do nothing - coords used as they are
			}
			// If a <point> is defined
			else if ($shape!==false && $size!==false) {
				if ($coords[2]==false) { $coords[2] = $coords[0]; }
				if ($coords[3]==false) { $coords[3] = $coords[1]; }
				// ELLIPSE
				if ($shape=='ellipse') {
					$corner1 = sqrt(pow($coords[0],2) + pow($coords[1],2));
					$corner2 = sqrt(pow($coords[0],2) + pow((1-$coords[1]),2));
					$corner3 = sqrt(pow((1-$coords[0]),2) + pow($coords[1],2));
					$corner4 = sqrt(pow((1-$coords[0]),2) + pow((1-$coords[1]),2));
					if ($size=='closest-side') { $radius = min($coords[0], $coords[1], (1-$coords[0]), (1-$coords[1])); }
					else if ($size=='closest-corner') { $radius = min($corner1, $corner2, $corner3, $corner4); }
					else if ($size=='farthest-side') { $radius = max($coords[0], $coords[1], (1-$coords[0]), (1-$coords[1])); }
					else { $radius = max($corner1, $corner2, $corner3, $corner4); }	// farthest corner (default)
				}
				// CIRCLE
				else if ($shape=='circle') {
					if ($w >= $h) {
						$coords[1] = $coords[3] = ($coords[1] * $h/$w) ;
						$corner1 = sqrt(pow($coords[0],2) + pow($coords[1],2));
						$corner2 = sqrt(pow($coords[0],2) + pow((($h/$w)-$coords[1]),2));
						$corner3 = sqrt(pow((1-$coords[0]),2) + pow($coords[1],2));
						$corner4 = sqrt(pow((1-$coords[0]),2) + pow((($h/$w)-$coords[1]),2));
						if ($size=='closest-side') { $radius = min($coords[0], $coords[1], (1-$coords[0]), (($h/$w)-$coords[1])); }
						else if ($size=='closest-corner') { $radius = min($corner1, $corner2, $corner3, $corner4); }
						else if ($size=='farthest-side') { $radius = max($coords[0], $coords[1], (1-$coords[0]), (($h/$w)-$coords[1])); }
						else if ($size=='farthest-corner') { $radius = max($corner1, $corner2, $corner3, $corner4); }	// farthest corner (default)
						$usew = $useh = $bboxw;
						$usey -= ($w-$h);
					}
					else {
						$coords[0] = $coords[2] = ($coords[0] * $w/$h) ;
						$corner1 = sqrt(pow($coords[0],2) + pow($coords[1],2));
						$corner2 = sqrt(pow($coords[0],2) + pow((1-$coords[1]),2));
						$corner3 = sqrt(pow((($w/$h)-$coords[0]),2) + pow($coords[1],2));
						$corner4 = sqrt(pow((($w/$h)-$coords[0]),2) + pow((1-$coords[1]),2));
						if ($size=='closest-side') { $radius = min($coords[0], $coords[1], (($w/$h)-$coords[0]), (1-$coords[1])); }
						else if ($size=='closest-corner') { $radius = min($corner1, $corner2, $corner3, $corner4); }
						else if ($size=='farthest-side') { $radius = max($coords[0], $coords[1], (($w/$h)-$coords[0]), (1-$coords[1])); }
						else if ($size=='farthest-corner') { $radius = max($corner1, $corner2, $corner3, $corner4); }	// farthest corner (default)
						$usew = $useh = $bboxh;
					}
				}
				if ($radius==0) { $radius=0.001; }	// to prevent error
				$coords[4] = $radius;
			}

			// -moz If entire function consists of only <stop> values
			else {	// default values
				// All values are set in parseMozGradient - so won't appear here
				$coords = array(0.5,0.5,0.5,0.5);	// default for radial gradient (centred)
			}
			$s = ' q';
			$s .= sprintf(' %.3F %.3F %.3F %.3F re W n', $x*_MPDFK, ($this->mpdf->h-$y)*_MPDFK, $w*_MPDFK, -$h*_MPDFK)."\n";
			$s .= sprintf(' %.3F 0 0 %.3F %.3F %.3F cm', $usew*_MPDFK, $useh*_MPDFK, $usex*_MPDFK, ($this->mpdf->h-($usey+$useh))*_MPDFK)."\n";
		}

		$n = count($this->mpdf->gradients) + 1;
		$this->mpdf->gradients[$n]['type'] = $type;
		$this->mpdf->gradients[$n]['colorspace'] = $colorspace;
		$trans = false;
		$this->mpdf->gradients[$n]['is_mask'] = $is_mask;
		if ($is_mask) { $trans = true; }
		if (count($stops) == 1) { $stops[1] = $stops[0]; }
		if (!isset($stops[0]['offset'])) { $stops[0]['offset'] = 0; }
		if (!isset($stops[(count($stops)-1)]['offset'])) { $stops[(count($stops)-1)]['offset'] = 1; }

		// Fix stop-offsets set as absolute lengths
		if ($type==2) {
			$axisx = ($coords[2]-$coords[0])*$usew;
			$axisy = ($coords[3]-$coords[1])*$useh;
			$axis_length = sqrt(pow($axisx,2) + pow($axisy,2));
		}
		else { $axis_length = $coords[4]*$usew; }	// Absolute lengths are meaningless for an ellipse - Firefox uses Width as reference

		for($i=0;$i<count($stops);$i++) {
	  if (isset($stops[$i]['offset']) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i',$stops[$i]['offset'],$m)) {
	  	$tmp = $this->mpdf->ConvertSize($m[1],$this->mpdf->w,$this->mpdf->FontSize,false);
	  	$stops[$i]['offset'] = $tmp/$axis_length;
	  }
		}


		if (isset($stops[0]['offset']) && $stops[0]['offset']>0) {
			$firststop = $stops[0];
			$firststop['offset'] = 0;
			array_unshift($stops, $firststop);
		}
		if (!$repeat && isset($stops[(count($stops)-1)]['offset']) && $stops[(count($stops)-1)]['offset']<1) {
			$endstop = $stops[(count($stops)-1)];
			$endstop['offset'] = 1;
			$stops[] = $endstop;
		}
		if ($stops[0]['offset'] > $stops[(count($stops)-1)]['offset']) {
			$stops[0]['offset'] = 0;
			$stops[(count($stops)-1)]['offset'] = 1;
		}

		for($i=0;$i<count($stops);$i++) {
			// mPDF 5.3.74
			if ($colorspace == 'CMYK') {
				$this->mpdf->gradients[$n]['stops'][$i]['col'] = sprintf('%.3F %.3F %.3F %.3F', (ord($stops[$i]['col']{1})/100), (ord($stops[$i]['col']{2})/100), (ord($stops[$i]['col']{3})/100), (ord($stops[$i]['col']{4})/100));
			}
			else if ($colorspace == 'Gray') {
				$this->mpdf->gradients[$n]['stops'][$i]['col'] = sprintf('%.3F', (ord($stops[$i]['col']{1})/255));
			}
			else {
				$this->mpdf->gradients[$n]['stops'][$i]['col'] = sprintf('%.3F %.3F %.3F', (ord($stops[$i]['col']{1})/255), (ord($stops[$i]['col']{2})/255), (ord($stops[$i]['col']{3})/255));
			}
			if (!isset($stops[$i]['opacity'])) { $stops[$i]['opacity'] = 1; }
			else if ($stops[$i]['opacity'] > 1 || $stops[$i]['opacity'] < 0) { $stops[$i]['opacity'] = 1; }
			else if ($stops[$i]['opacity'] < 1) {
				$trans = true;
			}
			$this->mpdf->gradients[$n]['stops'][$i]['opacity'] = $stops[$i]['opacity'];
			// OFFSET
			if ($i>0 && $i<(count($stops)-1)) {
		  if (!isset($stops[$i]['offset']) || (isset($stops[$i+1]['offset']) && $stops[$i]['offset']>$stops[$i+1]['offset']) || $stops[$i]['offset']<$stops[$i-1]['offset']) {
		  	if (isset($stops[$i-1]['offset']) && isset($stops[$i+1]['offset'])) {
		  		$stops[$i]['offset'] = ($stops[$i-1]['offset']+$stops[$i+1]['offset'])/2;
		  	}
		  	else {
		  		for($j=($i+1);$j<count($stops);$j++) {
		  			if(isset($stops[$j]['offset'])) { break; }
		  		}
		  		$int = ($stops[$j]['offset'] - $stops[($i-1)]['offset'])/($j-$i+1);
		  		for($f=0;$f<($j-$i-1);$f++) {
		  			$stops[($i+$f)]['offset'] = $stops[($i+$f-1)]['offset'] + ($int);
		  		}
		  	}
		  }
			}
			$this->mpdf->gradients[$n]['stops'][$i]['offset'] = $stops[$i]['offset'];
			$this->mpdf->gradients[$n]['stops'][$i]['offset'] = $stops[$i]['offset'];
		}

		if ($repeat) {
			$ns = count($this->mpdf->gradients[$n]['stops']);
			$offs = array();
			for($i=0;$i<$ns;$i++) {
				$offs[$i] = $this->mpdf->gradients[$n]['stops'][$i]['offset'];
			}
			$gp = 0;
			$inside=true;
			while($inside) {
				$gp++;
				for($i=0;$i<$ns;$i++) {
					$this->mpdf->gradients[$n]['stops'][(($ns*$gp)+$i)] = $this->mpdf->gradients[$n]['stops'][(($ns*($gp-1))+$i)];
					$tmp = $this->mpdf->gradients[$n]['stops'][(($ns*($gp-1))+($ns-1))]['offset']+$offs[$i] ;
					if ($tmp < 1) { $this->mpdf->gradients[$n]['stops'][(($ns*$gp)+$i)]['offset'] = $tmp; }
					else {
						$this->mpdf->gradients[$n]['stops'][(($ns*$gp)+$i)]['offset'] = 1;
						$inside = false;
						break(2);
					}
				}
			}
		}

		if ($trans) {
			$this->mpdf->gradients[$n]['trans'] = true;
			$s .= ' /TGS'.$n.' gs ';
		}
		if (!is_array($extend) || count($extend) <1) {
			$extend=array('true', 'true');	// These are supposed to be quoted - appear in PDF file as text
		}
		$this->mpdf->gradients[$n]['coords'] = $coords;
		$this->mpdf->gradients[$n]['extend'] = $extend;
		//paint the gradient
		$s .= '/Sh'.$n.' sh '."\n";
		//restore previous Graphic State
		$s .= ' Q '."\n";
		if ($return) { return $s; }
		else { $this->mpdf->_out($s); }
	}


	function parseMozGradient($bg) {
		//	background[-image]: -moz-linear-gradient(left, #c7Fdde 20%, #FF0000 );
		//	background[-image]: linear-gradient(left, #c7Fdde 20%, #FF0000 ); // CSS3
		if (preg_match('/repeating-/',$bg)) { $repeat = true; }
		else { $repeat = false; }
		if (preg_match('/linear-gradient\((.*)\)/',$bg,$m)) {
			$g = array();
			$g['type'] = 2;
			$g['colorspace'] = 'RGB';
			$g['extend'] = array('true','true');
			$v = trim($m[1]);
			// Change commas inside e.g. rgb(x,x,x)
			while(preg_match('/(\([^\)]*?),/',$v)) { $v = preg_replace('/(\([^\)]*?),/','\\1@',$v); }
			// Remove spaces inside e.g. rgb(x, x, x)
			while(preg_match('/(\([^\)]*?)[ ]/',$v)) { $v = preg_replace('/(\([^\)]*?)[ ]/','\\1',$v); }
			$bgr = preg_split('/\s*,\s*/',$v);
			for($i=0;$i<count($bgr);$i++) { $bgr[$i] = preg_replace('/@/', ',', $bgr[$i]); }
			// Is first part $bgr[0] a valid point/angle?
			$first = preg_split('/\s+/',trim($bgr[0]));
			if (preg_match('/(left|center|right|bottom|top|deg|grad|rad)/i',$bgr[0]) && !preg_match('/(<#|rgb|rgba|hsl|hsla)/i',$bgr[0])) {
				$startStops = 1;
			}
			else if (trim($first[(count($first)-1)]) === "0") {
				$startStops = 1;
			}
			else {
				$check = $this->mpdf->ConvertColor($first[0]);
				if ($check) $startStops = 0;
				else $startStops = 1;
			}
			// first part a valid point/angle?
			if ($startStops == 1) {	// default values
				// [<point> || <angle>,] = [<% em px left center right bottom top> || <deg grad rad 0>,]
				if (preg_match('/([\-]*[0-9\.]+)(deg|grad|rad)/i',$bgr[0],$m)) {
					$angle = $m[1] + 0;
					if (strtolower($m[2])=='deg') { $angle = $angle; }
					else if (strtolower($m[2])=='grad') { $angle *= (360/400); }
					else if (strtolower($m[2])=='rad') { $angle = rad2deg($angle); }
					while($angle < 0) { $angle += 360; }
					$angle = ($angle % 360);
				}
				else if (trim($first[(count($first)-1)]) === "0") { $angle = 0; }
				if (preg_match('/left/i',$bgr[0])) { $startx = 0; }
				else if (preg_match('/right/i',$bgr[0])) { $startx = 1; }
				if (preg_match('/top/i',$bgr[0])) { $starty = 1; }
				else if (preg_match('/bottom/i',$bgr[0])) { $starty = 0; }
				// Check for %? ?% or %%
				if (preg_match('/(\d+)[%]/i',$first[0],$m)) { $startx = $m[1]/100; }
				else if (!isset($startx) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i',$first[0],$m)) {
					$tmp = $this->mpdf->ConvertSize($m[1],$this->mpdf->w,$this->mpdf->FontSize,false);
					if ($tmp) { $startx = $m[1]; }
				}
				if (isset($first[1]) && preg_match('/(\d+)[%]/i',$first[1],$m)) { $starty = 1 - ($m[1]/100); }
				else if (!isset($starty) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i',$first[1],$m)) {
					$tmp = $this->mpdf->ConvertSize($m[1],$this->mpdf->w,$this->mpdf->FontSize,false);
					if ($tmp) { $starty = $m[1]; }
				}
				if (isset($startx) && !isset($starty)) { $starty = 0.5; }
				if (!isset($startx) && isset($starty)) { $startx = 0.5; }

			}
			// If neither a <point> or <angle> is specified, i.e. the entire function consists of only <stop> values, the gradient axis starts from the top of the box and runs vertically downwards, ending at the bottom of the box.
			else {	// default values T2B
				$starty = 1; $startx = 0.5;
				$endy = 0; $endx = 0.5;
			}
			$coords = array();
			if (!isset($startx)) { $startx = false; }
			if (!isset($starty)) { $starty = false; }
			if (!isset($endx)) { $endx = false; }
			if (!isset($endy)) { $endy = false; }
			if (!isset($angle)) { $angle = false; }
			$g['coords'] = array($startx ,$starty ,$endx ,$endy, $angle, $repeat );
			$g['stops'] = array();
			for($i=$startStops;$i<count($bgr);$i++) {
				$stop = array();
				// parse stops
				$el = preg_split('/\s+/',trim($bgr[$i]));
				// mPDF 5.3.74
				$col = $this->mpdf->ConvertColor($el[0]);
				if ($col) { $stop['col'] = $col; }
				else { $stop['col'] = $col = $this->mpdf->ConvertColor(255); }
				if ($col{0}==1) $g['colorspace'] = 'Gray';
				else if ($col{0}==4 || $col{0}==6) $g['colorspace'] = 'CMYK';
				if ($col{0}==5) { $stop['opacity'] = ord($col{4})/100; }	// transparency from rgba()
				else if ($col{0}==6) { $stop['opacity'] = ord($col{5})/100; }	// transparency from cmyka()
				else if ($col{0}==1 && $col{2}==1) { $stop['opacity'] = ord($col{3})/100; }	// transparency converted from rgba or cmyka()

				if (isset($el[1]) && preg_match('/(\d+)[%]/',$el[1],$m)) {
					$stop['offset'] = $m[1]/100;
					if ($stop['offset']>1) { unset($stop['offset']); }
				}
				else if (isset($el[1]) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i',$el[1],$m)) {
					$tmp = $this->mpdf->ConvertSize($m[1],$this->mpdf->w,$this->mpdf->FontSize,false);
					if ($tmp) { $stop['offset'] = $m[1]; }
				}
				$g['stops'][] = $stop;
			}
			if (count($g['stops'] )) { return $g; }
		}
		else if (preg_match('/radial-gradient\((.*)\)/',$bg,$m)) {
			$g = array();
			$g['type'] = 3;
			$g['colorspace'] = 'RGB';
			$g['extend'] = array('true','true');
			$v = trim($m[1]);
			// Change commas inside e.g. rgb(x,x,x)
			while(preg_match('/(\([^\)]*?),/',$v)) { $v = preg_replace('/(\([^\)]*?),/','\\1@',$v); }
			// Remove spaces inside e.g. rgb(x, x, x)
			while(preg_match('/(\([^\)]*?)[ ]/',$v)) { $v = preg_replace('/(\([^\)]*?)[ ]/','\\1',$v); }
			$bgr = preg_split('/\s*,\s*/',$v);
			for($i=0;$i<count($bgr);$i++) { $bgr[$i] = preg_replace('/@/', ',', $bgr[$i]); }

			// Is first part $bgr[0] a valid point/angle?
			$startStops = 0;
			$pos_angle = false;
			$shape_size = false;
			$first = preg_split('/\s+/',trim($bgr[0]));
			$checkCol = $this->mpdf->ConvertColor($first[0]);
			if (preg_match('/(left|center|right|bottom|top|deg|grad|rad)/i',$bgr[0]) && !preg_match('/(<#|rgb|rgba|hsl|hsla)/i',$bgr[0])) {
				$startStops=1;
				$pos_angle = $bgr[0];
			}
			else if (trim($first[(count($first)-1)]) === "0") {
				$startStops=1;
				$pos_angle = $bgr[0];
			}
			else if (preg_match('/(circle|ellipse|closest-side|closest-corner|farthest-side|farthest-corner|contain|cover)/i',$bgr[0])) {
				$startStops=1;
				$shape_size = $bgr[0];
			}
			else if (!$checkCol) {
				$startStops=1;
				$pos_angle = $bgr[0];
			}
			if (preg_match('/(circle|ellipse|closest-side|closest-corner|farthest-side|farthest-corner|contain|cover)/i',$bgr[1])) {
				$startStops=2;
				$shape_size = $bgr[1];
			}

			// If valid point/angle?
			if ($pos_angle) {	// default values
				// [<point> || <angle>,] = [<% em px left center right bottom top> || <deg grad rad 0>,]
				if (preg_match('/left/i',$pos_angle)) { $startx = 0; }
				else if (preg_match('/right/i',$pos_angle)) { $startx = 1; }
				if (preg_match('/top/i',$pos_angle)) { $starty = 1; }
				else if (preg_match('/bottom/i',$pos_angle)) { $starty = 0; }
				// Check for %? ?% or %%
				if (preg_match('/(\d+)[%]/i',$first[0],$m)) { $startx = $m[1]/100; }
				else if (!isset($startx) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i',$first[0],$m)) {
					$tmp = $this->mpdf->ConvertSize($m[1],$this->mpdf->w,$this->mpdf->FontSize,false);
					if ($tmp) { $startx = $m[1]; }
				}
				if (isset($first[1]) && preg_match('/(\d+)[%]/i',$first[1],$m)) { $starty = 1 - ($m[1]/100); }
				else if (!isset($starty) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i',$first[1],$m)) {
					$tmp = $this->mpdf->ConvertSize($m[1],$this->mpdf->w,$this->mpdf->FontSize,false);
					if ($tmp) { $starty = $m[1]; }
				}

				/*
				 // ?? Angle has no effect in radial gradient (does not exist in CSS3 spec.)
				 if (preg_match('/([\-]*[0-9\.]+)(deg|grad|rad)/i',$pos_angle,$m)) {
				 $angle = $m[1] + 0;
				 if (strtolower($m[2])=='deg') { $angle = $angle; }
				 else if (strtolower($m[2])=='grad') { $angle *= (360/400); }
				 else if (strtolower($m[2])=='rad') { $angle = rad2deg($angle); }
				 while($angle < 0) { $angle += 360; }
				 $angle = ($angle % 360);
				 }
				 */
				if (!isset($starty)) { $starty = 0.5; }
				if (!isset($startx)) { $startx = 0.5; }

			}
			// If neither a <point> or <angle> is specified, i.e. the entire function consists of only <stop> values, the gradient axis starts from the top of the box and runs vertically downwards, ending at the bottom of the box.
			else {	// default values Center
				$starty = 0.5; $startx = 0.5;
				$endy = 0.5; $endx = 0.5;
			}

			// If valid shape/size?
			$shape = 'ellipse';	// default
			$size = 'farthest-corner';	// default
			if ($shape_size) {	// default values
				if (preg_match('/(circle|ellipse)/i',$shape_size, $m)) {
					$shape = $m[1];
				}
				if (preg_match('/(closest-side|closest-corner|farthest-side|farthest-corner|contain|cover)/i',$shape_size, $m)) {
					$size = $m[1];
					if ($size=='contain') { $size = 'closest-side'; }
					else if ($size=='cover') { $size = 'farthest-corner'; }
				}
			}

			$coords = array();
			if (!isset($startx)) { $startx = false; }
			if (!isset($starty)) { $starty = false; }
			if (!isset($endx)) { $endx = false; }
			if (!isset($endy)) { $endy = false; }
			if (!isset($radius)) { $radius = false; }
			if (!isset($angle)) { $angle = 0; }
			$g['coords'] = array($startx ,$starty ,$endx ,$endy, $radius, $angle, $shape, $size, $repeat );

			$g['stops'] = array();
			for($i=$startStops;$i<count($bgr);$i++) {
				$stop = array();
				// parse stops
				$el = preg_split('/\s+/',trim($bgr[$i]));
				// mPDF 5.3.74
				$col = $this->mpdf->ConvertColor($el[0]);
				if ($col) { $stop['col'] = $col; }
				else { $stop['col'] = $col = $this->mpdf->ConvertColor(255); }
				if ($col{0}==1) $g['colorspace'] = 'Gray';
				else if ($col{0}==4 || $col{0}==6) $g['colorspace'] = 'CMYK';
				if ($col{0}==5) { $stop['opacity'] = ord($col{4})/100; }	// transparency from rgba()
				else if ($col{0}==6) { $stop['opacity'] = ord($col{5})/100; }	// transparency from cmyka()
				else if ($col{0}==1 && $col{2}==1) { $stop['opacity'] = ord($col{3})/100; }	// transparency converted from rgba or cmyka()

				if (isset($el[1]) && preg_match('/(\d+)[%]/',$el[1],$m)) {
					$stop['offset'] = $m[1]/100;
					if ($stop['offset']>1) { unset($stop['offset']); }
				}
				else if (isset($el[1]) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i',$el[1],$m)) {
					$tmp = $this->mpdf->ConvertSize($m[1],$this->mpdf->w,$this->mpdf->FontSize,false);
					$stop['offset'] = $el[1];
				}
				$g['stops'][] = $stop;
			}
			if (count($g['stops'] )) { return $g; }
		}
		return array();
	}

	function parseBackgroundGradient($bg) {
		// background-gradient: linear #00FFFF #FFFF00 0 0.5 1 0.5;  or
		// background-gradient: radial #00FFFF #FFFF00 0.5 0.5 1 1 1.2;

		$v = trim($bg);
		$bgr = preg_split('/\s+/',$v);
		$g = array();
		if (count($bgr)> 6) {
			if (strtoupper(substr($bgr[0],0,1)) == 'L' && count($bgr)==7) {  // linear
				$g['type'] = 2;
				//$coords = array(0,0,1,1 );	// 0 0 1 0 or 0 1 1 1 is L 2 R; 1,1,0,1 is R2L; 1,1,1,0 is T2B; 1,0,1,1 is B2T
				// Linear: $coords - array of the form (x1, y1, x2, y2) which defines the gradient vector (see linear_gradient_coords.jpg).
				//    The default value is from left to right (x1=0, y1=0, x2=1, y2=0).
				$g['coords'] = array($bgr[3], $bgr[4], $bgr[5], $bgr[6]);
			}
			else if (count($bgr)==8) {	// radial
				$g['type'] = 3;
				// Radial: $coords - array of the form (fx, fy, cx, cy, r) where (fx, fy) is the starting point of the gradient with color1,
				//    (cx, cy) is the center of the circle with color2, and r is the radius of the circle (see radial_gradient_coords.jpg).
				//    (fx, fy) should be inside the circle, otherwise some areas will not be defined
				$g['coords'] = array($bgr[3], $bgr[4], $bgr[5], $bgr[6], $bgr[7]);
			}
			$g['colorspace'] = 'RGB';
			// mPDF 5.3.74
			$cor = $this->mpdf->ConvertColor($bgr[1]);
			if ($cor{0}==1) $g['colorspace'] = 'Gray';
			else if ($cor{0}==4 || $cor{0}==6) $g['colorspace'] = 'CMYK';
			if ($cor) { $g['col'] = $cor; }
			else { $g['col'] = $this->mpdf->ConvertColor(255); }
			$cor = $this->mpdf->ConvertColor($bgr[2]);
			if ($cor) { $g['col2'] = $cor; }
			else { $g['col2'] = $this->mpdf->ConvertColor(255); }
			$g['extend'] = array('true','true');
			$g['stops'] = array(array('col'=>$g['col'], 'opacity'=>1, 'offset'=>0), array('col'=>$g['col2'], 'opacity'=>1, 'offset'=>1));
			return $g;
		}
		return false;
	}



}

?>